Stone-dressing machine



(No Model.) Y

J. J. PRATT 8v H. B. STILLMAN.

STONB'DRESSING MACHINE.

Patentedvv Oct. 21

"mimi" m INI.

\/\/|'TNESSES:: CM,

llivrrnn States larnnr rtree.,

JOHN J. PRAT", OF WTAKEFIELD, AND HENRY B. STILLMAN, OF BOSTON,

MASSACHUSETTS.

STONE-DRESSING MACHINE.

'QTECEFECATON forming part el' Letters Patent No. 306,772, dated October 21,1884.

Application tiled March 7` 1F84.

To all rif/tom it 'nt/ity concern:

Be it known that we, JOHN J. PRATT, of lVakeiield, county of Middlesex, and HENRY B. STILLMAN, of Boston, in the county of Suffolk, both in the State of Massachusetts, have invented certain Improvements in Stone- Dressing Machines, otl which the following is a specification.

This invention relates to that class of stonedressing machines in which a rotary grinding or rubbing wheel is employed, which is capable of being moved about by the operator over the surface to be dressed, the lower side of the wheel constituting its acting surface.

The invention has for its object to provide certain improvements in the means employed l'or supportingand for rotating the wheel, as we will now proceed to describe.

Of the accompanying drawings, forming a part of this specification, Figure l represents a perspective view of an organized machine embodying our improvements.

wheel and its attachments. Fig. 3represents a similar section showing the wheel supported so that its periphery can act instead of its under side.

The same letters of reference indicate the same parts in all the iigurcs.

ln the drawings, a represents the grinding or rubbing wheel, which will usually be made of sandstone or emery, and is secured by set-screws to a metal cap, a. The upper portion of said cap has a plate, at, bolted toit, and between the cap and the plate c is formed a spherical cavity or socket. r y

b represents a vertical stud, having at its lower end a spherical enlargement or ball, b, fitted in the above-mentioned socket. The wheel and its cap are adapted to be tilted er inclined in any direction on the ball b, the oriiice in the plate a, through which the stud b passes, being considerably larger than said stud, so as to allow the wheel to be inclined as may be desired, and thus adaptits acting suria-ce to the inclination, if any, ot' the surface on which it acts. The stud b is .affixed to an arm, c, having at its outer end suitable handles, d d, adapted to be grasped by the opcrator, and at its rear end a counterbalancingweight, d, which is adjustable on the arm c,

Fig. 2 reprel. sents a vertical central section through the (No model.)

and thus enables the pressure of the Wheel against the surface ou which it acts to be adjusted. The arm is pivoted to the lower end of a pendulous arm, f, which is hung so as to oscillare upon a driving-shaft, g, supported iu fixed hangers h 7i. The arm j' is made in sections 2 3, the lower section, 3, to which the arm c is pivoted, being swiveled to the main section. The wheel a is thus adapted to be moved in any direction by the operator. The wheel is rotated by means of a belt, t, running from a pulley, j, on the drivingshaft g under idle-pulleys lc 7i: on the trunnions, which connect the arm f with the arm c, and around a pulley, Z, secured to the holder a. The pulley Z surrounds the balland-socketjoint, above described, so that the center oi" the width of the belt on said pulley will always coincide with a plane intersecting the center of said joint at right angles with the axial line of the wheel. This arrangement 'of the pulley enables the wheel to be inclined in any direction without varying the tension of the belt to any material extent, the operative relation of the belt to the pulley being unchanged by any inclination that the wheel and pulley are capable of assuming. The arrangement of the beltsupporting pulleys enables a single belt to communicate motion from the driving-shaft mounted in fixed bearings to the universallymovable wheel.

It being desirable to introduce water between the acting surface ofthe wheel and the surface on which it acts, we provide the stud b with a longitudinal passage extending throughthe ball b', the stone a and its holder being provided with coinciding apertures o, as shown in Fig. 2. A flexible water-pipe, p, is connect-ed with the upper end oi" the stud b by a metal terminal secured to said flexible pi pe and inserted in the st-ud b.

In case it is desirable to prevent the wheel and its holder from tipping on the ball b', a collar, o', 011 the stud b may be slipped downwardly into the orifice in the socket-plate a2, as shown in Fig. 2, said collar nearly filling the oriiice, and thus preventing such lateral movement.

Fig. 3 shows the wheel raised and supported by a standard, s, having an` anti-friction roller or caster, t, at its lower end, adapted to IOO niort; about, on '.1 supporting nnrl'uoe, tho upper end ot' Suid stnndnrd boing inserted in tho pnssngo in tho hall b. When thewheel is thus supported, its; periphery nitty he @tinged to not on tho edges o1' articles o1' stone to ho l'orined or dressed. `The poriphery ot' tho wheel muy ho rnoldod to inipurt :i rorrospondinggly-niolded g l'orln to the article on which the wlioel nets. t Tho Stmuhirds muy bo ot'tolesoopic eoin'st'rneA i tion, so that it cnn he :nljuntod ne; to length, t nndthns support tho whoel nt tiny desired l height. \\/'hentlio Stnnrhird is usod, tho colt lnr i' Should ho ndjuSted to prevent the whoel l l'roni osoilhiting on the hull b. i lt iS obvious that, tho whoel nniy he ot' intitnblo construction to polish stonel or other Snri'ziceS, instead oli' :ihrudingg theni, :unl to thin t ond muy ho .mudo ol' wood covered with n Snitnhl@ tnhrio or leather to hold n polishingr-Ijiow der. Y i

Tho nluohino nrny, il" desirod, ho provided with intorclmngenhle grinding :ind polishing` i wheels.

Vf@ Chinnl1.. In zi Stono-dreising machine7 the holder oonnootod to u supporting-mun by it lmll-undsookotjoint und provided with u. pulley nur rounding` Snidjoint :ind with n wheel7 u, 21S Set l'o 1 th. Q 2. The colnhnuition oltho sookotod. holdor 11 having the wheol (t, find the Stud I), hnvingthe l hull 7), und n, water-pnssujgo passing through @uid stud und hull und coinciding with :in oriiiro in the wheel, :is set .tor-th.

2). ,lhe oonibinzniion7 with tho sookotod holdor haring the stone-dressing wheel, of tho Stud hitting tho hull iitting the Boeket ot' tho holdor und u oolhn: ndnpted to proronttheholdorund j ita; wheol l'roni osoillnting on tho Stud, :iS sot forth.

Lt. Tho (-oinbinntion ot' tho holdor nndits wheel, tho jointed suriporti]ig-nrins c j", tho tol-nier lining connected to tho holder by u bolt :ind-toohctj oint, tho d riVing-iiulley y',zlnd idiopnlteyn '/.rl.r, und the single lhelt arranged to s eon'nnuniouto motion troni tho driving-pulley t to tho wheel a, ns set forth.

5. llho combination of tho wheel, tho soot@ etod holder, tho stud Z), hnvine; :t longitudinali 50, und tho :Atnndurd x, adapted to ho in- :st ted in Suid pnntsngo nud tosup] ort the wheel, un set forth.

In tostinlony whorootwo luLvo signed our nznnos to this sijiooilioiition, in tho prese/noo ol' two milisoriliingg witnesses, this L.tth dny oi" ilnrelh 1185i. 

